Well, regarding the movie player, you have two choices really, xine and mplayer. They should handle quicktime, though you may have to install extra codecs. Eventually you can install these from source, but, since you're new, perhaps you'd be better off with the binaries, if you can find them.
Firstly, do a "whereis xine" and also a "whereis mplayer" just in case you have them already. Then if not, hunt around.
does have binary rpms for Suse, but I'm fairly sure there are no binaries for mplayer.
Maybe the soundcard isn't seated properly ?